Safety lamp for mines



Feb. 28, 1928.

H. TAKATA SAFETY LAMP FOR MINES Filed. sept. 15, 1925 Patented Feb. 28, 192,8.

HUznWo frenare,

or TOKYO, Jaren.

' SAFETY LAMP FOB MINES.

Application filed September The principalV object of the present invention is to provide a safety lamp with which the amount of those gases contained in the lair in mines which are liable to an explosion can be easily measured. At present, gas measuring lamps are used for Vthe purpose of measuring gases and ordinary lamps serve for the lightening only. As it is difficult to use these measuring lamps from place to place, in mines, miners are unaware even of the nearest approach of danger. But if the safety lampsof this invention are used in place of ordinary lamps, gases can easilybe measured whenever and wherever necessary, and consequent-ly the danger of'explosion can be avoided.

Further, safety ylamps -of this `invention' are so constructed as to facilitate an accurate measurement of gases.

Another object of this invention is to provide a safety lamp, in which the tire is extinguished, before the lamp chimney 1s removed, and therefore the lire is in no Case exposed to the air.V

According to the present invention, therefore, a cap is provided to secure a wick holder at a center part of lamp, and on the said cap stand vertically indicating needles or pins, by means of which the height of' flame is measured. rest` or support forv a lamp chimney is adapted to be screwed with the cap, an

out the fire.'

The invention will now be described more completely with. reference tothe 'accru/upany-v 'ing drawings in which :qV

Fig. 1 is a partly sectional elevation of a safety lamp according to the present invention, and y Fig. 2 is a sectional plan view of the same. Inthese drawings, (a) represents a hollow dome-shaped cap, forming a cylindrical block at its center part, which is provided with a hole (c), piercing vertically through the block. A wick is held in the Wick holder (t) which is adapted to fit closely to thehole (c) and slides upwards-and downwards therethrough. Several indicating pins (d) of different length are-fixed to the upper surface of the cap (a) and stand vertically on it and around the hole (c).

The lower-most part of the outside periphery of the lcap (a) is threaded as at (e), and its inner lowermost v.circumference is formed into an annular flange (g), pro-v The cap (c) is while releasing from an oil' pot, brings the cap upward with it, and put 15, 1925. serial Nq. 56,447;

vided with recesses'or void spaces (7L) and (i) ,Y for the fastenings (7c) and (j) respectively,'flxed to theupper surface of the-oil pot'C/n). vThe fastening is adapted to passl through the recess (@,and the fasten? ing (la) through the recessA (fi).

The support or rest (o) for the lamp j chimney (Q) is fastenedto aring or short cylnderK'p), by passing outwardly pro- Jectingr` pins 'fixed on the outer Asurface of lthe support (o.) through the void placeson the innervsurface of the ring (p), and partlyV rotating the support (o) until the above pins are arrested by the pins vstanding on the yupper ysurface of 'the ring (p).- r-lhus the-support y(o) is'kept onf the ring against` v the action of the spring pressing the lamp' chimney downward. The` support (o) is ladapted -to be connected also with `the capv (a) by' means ofthe threads (e) of the cap '(az) and the nut (e) formed ou the inner surface of the'cylindrical boss of the support (o). i y l. y

y n connected or disconnected with ythe oil pot (mi) bypassing the fastenings and (lo) through thevoid spaces (i) and (h) on the flange respectivelyg I y To connect the support 0) with the cap (601s as follows The support (o) for the lamp chimney isfirst fastened yto the ring (p),`and the cap ,(a)'to the yoil pot (m).

'Then the oil pot (m) is connected with the ring by means of the screivm) by their relative rotation., the threads (e) of the cap (c) being fastened to the support (o) at the same time. Thus the cap is connected with the support v(0)' and is pressed by it against the oil pot (m) as shown in the Figures (l) and lVith these constructions, when the `oil pot (m) 1s released from the ring (p), the

cap remains fastened to the support (.10),.and therefore the wick holder (t) is lower-ed relatively to the cap (a), and the fire extinguished. Thus the fire is in no case exposed to the air.

-The flange (g) of the cap (a) is pro-` s vide-d with two void spaces other than the void spaces (It) and (i). They are formed smaller than (la) and (i), and serve to fastenthecap (a) to the oil pot (m) by engaging with the projection (n) of the fastening when the oil pot (m) is withdrawn from the ring (p), and, therefore, the cap (a) is withdrawn together with the oil pot (m). Y

The" wick holder (b) is' moved `upwards and downwards by means of a screw bolt The principal advantage of this invention is that the amount of gases in mines can be measured without using measuring lamp. For this purpose, the wick holder (b) is is lowered slowly until combustion ofoil sucked up by the wick becomes minimum, and the gases entering into the lamp chimne'y burns on the holes (c). The heightof iiame, judged by comparing with those of indicating pins (el) indicates the percentage of gases contained in thevair. In measuring lamps, nowl in use, indicating scales are fairly apart from flame, and therefore, it is kunable to4 know the amount of gases. accurately, this being effected in a safetylam according to the present invention, in whic `the indicating needles` stand close to Vflame to he observed. y

Vhat I claim-as ,new is: 1 y 1 A` safety lamp `of the character described` including, in combination, an oil pot or reservoir, a chimney, means detachably connected to said oil pot `or `reservoir for `supporting said chimney, a hollow domeshaped cap adaptedto be connected to said supporting means and also having aconnection with said pot or reservoir, said last-V mentioned connection permitting limited relative movementbetween the parts` whenv 1 released, said cap having a bored projection to receive a wick, and a. plurality ofindicatingpins extending vertically upwardly from the outer surface of said cap adjacent said bored projection whereby the height of Haine due to theV combustion of explosive Ygases can bemeasuredjby comparison.

2. VA safety lamp ofA the character described including, in combination, an oil pot or reservoiig, a chimney, a supporting means for said chimney, a'ring or annular member to which said supporting means is adapted to be connected, said supporting means also being adapted yto beconnected tosaid oil pot orreservoir, a `hollowdome-shaped cap provided with a centrally located and bored projection, a wick holder connected to'said pot lor reservoir and slidable in said bored .i

connected to said oil pot'or reservo`ir,`a" hollow dome-shaped cap member provided with a centrally located bored projection and adapted to be connected to said supporting means, a wick holder connected to said pot or reservoir and slidable insaid bored pro-` ]ection 4and means connectingsaid pot or reservoir and said cap but permitting a liinited relative movement between them. p

4. A safety lamp of the ycharacter de-` scribed including, in combination, ari'oil pot or reservoir, a chimney, means for support-` ing said chimney adapted to bedetachably connected to said oil pot or reservoir, a hollow dome-shaped cap Vmember provided with` a centrally located bored projection and adapted to be connected to said supporting means,V a wick holder connected to said pot or reservoir and slidable said bored projection and means connecting said' pot or reservoir and said cap but perniittinga limited relative .I movement `between them, said means including a flange on said cap and engagingmembers connected to said pot or reservoir. i

In testimony whereof,l havesigned my name to this specification. x i

HUZEWO TAKATA. L. s] 

